Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 320
tches, the series relay preparingthings for the next function. The interrupter relay IR prepares therotary-magnet circuit for use at the first idle level. At the end of the group of impulses, the vertical wiper VW takescharge of the vertical magnet and causes it to select an idle level. Thevertical… … ■~-tV Fig. 251.—Toll and local connector. vertical wiper finds ground, the vertical relay VRy is energized and thevertical magnet caused to vibrate alternately with the interrupter relay(instead of the rotary magnet). When the vertical wiper finds no ground,the vertical relay falls back and…
Telephone
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